Central office multicustomer private branch exchange system



May 24, 1966 D. R. FISHER ETAL CENTRAL OFFICE MULTICUSTOMER PRIVATE BRANCH EXCHANGE SYSTEM Filed May 1, 1962 46 Sheets-Sheet 2 y 24, 1965 D. R. FlSHER ETAL 3,253,088

CENTRAL OFFICE MULTICUSTOMER PRIVATE BRANCH EXCHANGE SYSTEM May 24, 1966 D. R. FISHER ETAL CENTRAL OFFICE MULTICUSTOMER PRIVATE BRANCH EXCHANGE SYSTEM Filed May 1, 1962 7CT 3 GCTI 6CT2 D 6CT4 6CT2 an? BCTO 7cm 7C TA6 46 Sheets-Sheet 7 FIG. 7

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CENTRAL OFFICE MULTICUSTOMER PRIVATE BRANCH EXCHANGE SYSTEM y 1966 D. FISHER ETAL 3,253,088

CENTRAL OFFICE MULTICUSTOMER PRIVATE BRANCH EXCHANGE SYSTEM y 4, 1966 D. R. FISHER ETAL 3,253,088

CENTRAL OFFICE MULTICUSTOMER PRIVATE BRANCH EXCHANGE SYSTEM Filed May 1, 1962 46 Sheets-Sheet 10 PART 0F FIG. /0 INC, REG X Mmcomccr. TR

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May 24, 1966 D. R. FISHER ETAL CENTRAL OFFICE MULTICUSTOMER PRIVATE BRANCH EXCHANGE SYSTEM 46 Sheets-Sheet 12 Filed May 1, 1962 May 24, 1966 FlSHER ETAL 3,253,088

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CENTRAL OFFICE MULTICUSTOMER PRIVATE BRANCH EXCHANGE SYSTEM Filed May 1, 1962 4a Sheets-Sheet 15 FIG. /5

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CENTRAL OFFICE MULTICUSTOMER PRIVATE BRANCH EXCHANGE SYSTEM 1966 D. R. FISHER ETAL 3,253,088

CENTRAL OFFICE MULTIOUSTOMER PRIVATE BRANCH EXCHANGE SYSTEM May 24, 1966 D. R. FISHER ETAL CENTRAL OFFICE MULTICUSTOMER PRIVATE BRANCH EXCHANGE SYSTEM Filed May 1, 1962 46 Sheets-Sheet 18 May 24, 1966 D, R. FISHER ETAL CENTRAL OFFICE MULTICUSTOMER PRIVATE BRANCH EXCHANGE SYSTEM Filed May 1 1962 .6 Sheets-Sheet 19 48 mm FIG. /9

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15 F6. STEERING CCT raise 5w stU THRU CONTACTS 0F INTERM. F5 RELAYS May 24, 1966 D. R. FISHER ETAL. 3,253,088

CENTRAL OFFICE MULTICUSTOMER PRIVATE BRANCH EXCHANGE SYSTEM Filed May 1, 1962 46 Sheets-Sheet 2O 

1. A TELEPHONE SWITCHING SYSTEM COMPRISING A PLURALITY OF LINES AND TRUNKS, A PLURALITY OF LINE SWITCHES AND TRUNK SWITCHES, SAID LINES APPEARING ON SAID LINE SWITCHES AND SAID TRUNKS APPEARING ON SAID TRUNK SWITCHES, SAID LINES AND SAID TRUNKS EACH BEING CAPABLE OF EXHIBITING A CALLING CONDITION REQUIRING THE EXTENSION OF A CONNECTION OVER SAID SWITCHES FROM SAID CALLING ONE OF SAID LINES TO ANY OF SAID TRUNKS AND FROM SAID CALLING ONE OF SAID TRUNKS TO ANY OF SAID LINES, A MARKER RESPONSIVE TO SAID CALLING CONDITIONS FOR OPERATING SAID LINE SWITCHES AND SAID TRUNK SWITCHES TO EXTEND SAID CONNECTIONS, SAID MARKER MEANS NORMALLY RECORDING THE CLASS OF SERVICE ASSIGNED TO SAID CALLING ONES OF SAID LINES, MEANS RESPONSIVE TO THE NUMBER CALLED BY SAID CALLING ONE OF SAID LINES AND TO SAID CLASS OF SERVICE OF SAID CALLING LINE FOR SELECTING ONE OF SAID TRUNKS, MEANS CONTROLLED BY THE SELECTED ONE OF SAID TRUNKS FOR SEIZING THE APPEARANCE OF THE LINE CALLED BY SAID CALLING LINE, MEANS FOR ASCERTAINING THE CLASS OF SERVICE OF SAID LINE CALLED BY SAID CALLING LINE, MEANS FOR COMPARING SAID LAST-MENTIONED AND SAID LAST-MENTIONED CLASSES OF SERVICE, AND MEANS CONTROLLED BY SAID COMPARING MEANS FOR CONTROLLING SAID MARKER TO COMPLETE THE OPERATING OF SAID SWITCHES WHEN SAID CLASSES OF SERVICE MATCH. 